| Company | Location | Certifications | License # |
|---|---|---|---|
| Andres J Jr Vasquez | — | Inspector (Maintenance Provider) | MP0002587 |
| Brandon Jones | — | Installer (Class II) | OS0033398 |
| Brodie Burton | — | Installer (Class II)Inspector (Maintenance Provider) | OS0040006 |
| Byron L Beale | — | Installer (Class II) | OS0005672 |
| Cecil A Pe Cheshier | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0033045 |
| Dan A Pe Franke | — | Inspector (Maintenance Provider) | MP0000848 |
| David Alexander Garcia | — | Designer (Site Evaluator) | OS0038222 |
| David Scott Millican | — | Designer (Site Evaluator) | OS0040941 |
| Derek T Dieleman | — | Installer (Class II)Inspector (Maintenance Provider) | OS0033475 |
| Donny C Bartel | — | Installer (Class II)Inspector (Maintenance Provider) | OS0021955 |
| Ethan J Sanders | — | Inspector (Maintenance Provider) | MP0002594 |
| Gavin Rain Knighton | — | Installer (Class I) | OS0040820 |
| Geoffrey A Prose | — | Installer (Class II)Inspector (Maintenance Provider) | OS0005006 |
| Gregory Kelsey | — | Designer (Site Evaluator) | OS0040396 |
| Gregory M Starr | — | Installer (Class II)Inspector (Maintenance Provider) | OS0024604 |
| Guy Eric Lehrman | — | Installer (Class II)Inspector (Maintenance Provider) | OS0023267 |
| Ira O Wyse | — | Installer (Class II)Inspector (Maintenance Provider) | OS0003737 |
| Jason Bagley | — | Installer (Class II) | OS0041579 |
| Javed Aslam | — | Installer (Class I) | OS0038148 |
| Jay R Rs Pinkston | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0001520 |
| Jessica Tisdale | — | Installer (Class I)Designer (Site Evaluator) | OS0040180 |
| Joey P Tisdale | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0037721 |
| John Dale Rs Glover | — | Designer (Site Evaluator) | OS0022758 |
| John K Warren | — | Installer (Class II) | OS0003983 |
| John L Rs Hallen | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0022911 |
| Joseph A Mcpherson | — | Installer (Class I) | OS0037111 |
| Joshua Hoeft | — | Installer (Class I) | OS0038787 |
| Kevin L Westman | — | Inspector (Maintenance Provider) | MP0002645 |
| Ladon Bryant Neal | — | Installer (Class I) | OS0038946 |
| Larry M Gabbard | — | Installer (Class II) | OS0001002 |
| Leslie R Rs Freeman | — | Designer (Site Evaluator) | OS0030268 |
| Lindsay D Garcia | — | Designer (Site Evaluator) | OS0031437 |
| Luis Rodriguez | — | Installer (Class II) | OS0039869 |
| Michael E Sr Ihrig | — | Inspector (Maintenance Provider) | MP0000159 |
| Patrick Ryan Wyse | — | Installer (Class II)Inspector (Maintenance Provider) | OS0039364 |
| Reuben S Acton | — | Installer (Class II)Inspector (Maintenance Provider) | OS0035873 |
| Richard A Testa | — | Installer (Class II) | OS0031801 |
| Richard Neal Mcpherson | — | Installer (Class II)Inspector (Maintenance Provider) | OS0001264 |
| Richard Wayne Milam | — | Designer (Site Evaluator) | OS0011767 |
| Rickie L Ashley | — | Installer (Class II)Inspector (Maintenance Provider) | OS0019842 |
| Sonia Lucero Salazar | — | Installer (Class I) | OS0040137 |
| Teddy Glenn Jr Acton | — | Installer (Class II)Inspector (Maintenance Provider) | OS0008167 |
| Tom Ralph Dieleman | — | Installer (Class II)Inspector (Maintenance Provider) | OS0006228 |
43 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Denton County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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